# STE Capacitors and Varistors Reported in Four Portable Power Stations > A Chongdiantou report identifies STE safety capacitors, film capacitors and varistors in four portable power stations. - Original report: August 13, 2025 - STE edition: October 2, 2026 - Category: Engineering insights - Page: https://www.songtian-ste.com/en/news/ste-capacitors-in-portable-power-stations-2025/ - Chinese version: https://www.songtian-ste.com/zh/news/ste-capacitors-in-portable-power-stations-2025/ Chongdiantou's August 2025 report examines STE components reported in four portable power stations: Jackery 2000 Pro 2, EcoFlow RIVER 3, RIVER 3 Plus and DELTA Max 1600. It identifies several capacitor families and varistors, linking them to the publisher's earlier teardown coverage. The observations are useful as a component inventory; they do not demonstrate that a particular component causes the finished product's output capability or reliability. ## Jackery 2000 Pro 2 The source describes a portable power station with a front display, lighting, USB-C and USB-A ports, a 12 V vehicle-style output and two Chinese AC outlet groups. It reports an AC output capability of 2200 W. The report concerns the Chinese-market 2000 Pro 2; no equivalence to another regional model is assumed. Four STE capacitor families are identified: Jackery 2000 Pro 2 | Reported family | What the source identifies | | --- | --- | | CE ceramic Y2 | Multiple blue Y capacitors assigned to the CE family | | X2 | STE X2 safety capacitors | | CBB21 | A film capacitor marked 2.2 µF, 630 V | | CBB21B | Four boxed film capacitors described as a parallel resonant-capacitor arrangement | The article describes CE devices as ceramic capacitors with flame-retardant epoxy encapsulation. Its X2 overview lists several AC voltage options. CBB21 and CBB21B are described as metallized polypropylene film families, with encapsulated and boxed constructions respectively. These family descriptions are separate from the exact identity and operating conditions of the observed parts. ## EcoFlow RIVER 3 Chongdiantou describes the RIVER 3 as a 245 Wh lithium iron phosphate portable power station with a bidirectional inverter. The report lists 300 W charging and output capability, a 600 W operating claim under the product's load-support mode, solar or vehicle DC input, and a USB-C port supporting 100 W PD charging. The higher mode figure should not be read as an independently verified continuous output rating. The reported STE components are a CBB21 film capacitor, a 2.2 µF X2 capacitor and a varistor marked 14D471K. The source assigns the varistor an overvoltage-surge protection role. Its marking is retained as observed identification rather than expanded into a full ordering code. ## EcoFlow RIVER 3 Plus The RIVER 3 Plus is presented as a 600 W, 286 Wh portable power station. The source mentions a 1200 W X-Boost mode, USB-C and USB-A outputs, a 100 W USB-C output and a 12 V vehicle-style connection. These figures describe the equipment in the report and should not be conflated with component ratings. Chongdiantou identifies a STE CBB21B boxed metallized polypropylene film capacitor with a capacitance of 2.2 µF. The report's broader CBB21B overview discusses low loss, self-healing behavior and insulation resistance, but does not provide a complete electrical or thermal operating profile for this installed part. ## EcoFlow DELTA Max 1600 The report describes the DELTA Max 1600, referenced as EFD311, with a 1612 Wh lithium battery and 2000 W inverter output. It also lists an emergency power supply function with a stated 30 ms switchover, two 100 W USB-C ports and four USB-A ports. At the input, the source identifies a STE varistor as 20D471K and describes its use for AC-input overvoltage protection. As with the RIVER 3 example, this observation does not supply the complete part specification or establish the system's surge-test performance. ## Reading the component inventory The four products span CE, X2, CBB21, CBB21B and varistor families. Varistors are protection resistors, not safety capacitors; this distinction corrects the source conclusion's grouping. The reported circuit roles and component markings remain attributed to Chongdiantou. For component selection, confirm the exact variant, current specification, safety requirements and circuit conditions. The source's broad statements about approvals or harsh-environment reliability should not be applied to every component without that evidence. The original provides the underlying product-report links and additional coverage of STE SMD NTC, SMD MOV and surface-mount Y capacitors. ## Figures and tables from the original report The following figures retain their original captions, markings and historical context. Transcribed tables present the values shown in the published images; product selection should use the specifications for the selected part. [Illustration from the original report — source figure 1](https://www.songtian-ste.com/assets/news/chongdiantou/699da6a5ca3ec58014d44c5cad6cc2ac9ae0762c1bb2838d8ca13c0cb6c67cba.webp) Figure 1. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18re8mozn6mqol9r) [Illustration from the original report — source figure 2](https://www.songtian-ste.com/assets/news/chongdiantou/146597258354ea9d03924ecb4624d8a6a3c6105c7694b1f5ecd287956bbae72e.webp) Figure 2. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18relpt7mrlqxwmu) [Illustration from the original report — source figure 3](https://www.songtian-ste.com/assets/news/chongdiantou/28fb7b777f1b9ef120b977bb0deae51858f41bc52cd1a2289c5a893e162cfb0d.webp) Figure 3. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rez11glt5oth8h) [Illustration from the original report — source figure 4](https://www.songtian-ste.com/assets/news/chongdiantou/4d76954cc543a087fc17ab4ab0ae5861048c429314e5b54b4b24ee54fb2205f9.webp) Figure 4. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rfbikiq8w7ummm) [Illustration from the original report — source figure 5](https://www.songtian-ste.com/assets/news/chongdiantou/92dbe78cf727efe660540ecf5b18ac456511c09261737f2f1b5a53761ee7b837.webp) Figure 5. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rfoe1w9wqdrxm5) [Illustration from the original report — source figure 6](https://www.songtian-ste.com/assets/news/chongdiantou/10f94999b31078938bc8dd4d93da2e7ce281b5343463ccfb4d6d3ca6411632e0.webp) Figure 6. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rfzyqef5ghk5jf) [Illustration from the original report — source figure 7](https://www.songtian-ste.com/assets/news/chongdiantou/2f4187cf567ace11cacaec193ad23ce50c2d0e6d76d5d99ad682fb88795a12a2.webp) Figure 7. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rgdj7d2lvm5bss) [Illustration from the original report — source figure 8](https://www.songtian-ste.com/assets/news/chongdiantou/37953bfd7176cb2c9035392aad4b3d91e48d68a7ce2f05fa11a1138079ddd67f.webp) Figure 8. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rgqdrmbjafnc9t) [Illustration from the original report — source figure 9](https://www.songtian-ste.com/assets/news/chongdiantou/bcfdc93315967053769eb1c3792f3e1a11a3a1bf78952f742dd7b75d665017f3.webp) Figure 9. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rh2w27zia4i2vj) [Illustration from the original report — source figure 10](https://www.songtian-ste.com/assets/news/chongdiantou/b6ff7beff1842bbb809741cabeb39f6fa56f49ffc2eacbf344bab86a15cd3c68.webp) Figure 10. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rhf0xahaqsuhlt) [Illustration from the original report — source figure 11](https://www.songtian-ste.com/assets/news/chongdiantou/642ee953cb03a19704a4cbdb96eaca82be94fe92ea41207060738d670a66af50.webp) Figure 11. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rhs8hdsqjaldl4) [Illustration from the original report — source figure 12](https://www.songtian-ste.com/assets/news/chongdiantou/c84751569c5625c000cd418b7db68ffb9efe29e660416933df632d39ac4c02ec.webp) Figure 12. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rib5tklogrkzup) [Illustration from the original report — source figure 13](https://www.songtian-ste.com/assets/news/chongdiantou/5d1a28ded90a6049109df7484868c8e990e346d9377b6b0096d2fe343eda382f.webp) Figure 13. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18riyselvxtumfag) [Illustration from the original report — source figure 14](https://www.songtian-ste.com/assets/news/chongdiantou/a4381d86c0435a0e7fee10cb118b6f2880a130a639e6f0960df7eb47355088af.webp) Figure 14. Illustration from the original report. Image: Chongdiantou. [Image source](https://static.chongdiantou.com/uploads/2025/08/13/dc18rji7z1c58ezoue) ## Related reading cited by the original report Chinese source titles are retained below. [拆解报告：正浩RIVER 3 300W 245Wh氮化镓户外电源](https://mp.weixin.qq.com/s/byaao1ZuXS16hylTTthGDw) [拆解报告：正浩 睿 RIVER 3 Plus 600W 286Wh户外电源](https://mp.weixin.qq.com/s/A7UegeuoLpT7_LSen5gs6g?token=999441680&lang=zh_CN) [拆解报告：EcoFlow正浩2000W户外电源 德Max 1600（EFD311）](https://mp.weixin.qq.com/s/It6DBCoKBC5aBbEGNLKYAA) [户外电源拆解报告：电小二极致安全2度电](https://mp.weixin.qq.com/s/-ngudylKdnbXdoUBzdJReg) [松田推出扛雷击贴片NTC，助力快充开发更小、更薄](https://mp.weixin.qq.com/s/Rn3MVnQnepYg9z5ab-DZ-A?token=1514868907&lang=zh_CN) [更薄、更轻量，松田推出SMD系列贴片压敏电阻](https://mp.weixin.qq.com/s/bcJtWMwsF80Op_kwgOJORQ) [松田推出SMD-X1Y1、SMC-X1Y2两款贴片Y电容](https://mp.weixin.qq.com/s/TSUDImh6hApI4oPPZeh-Aw?token=1514868907&lang=zh_CN) [正浩、隆鑫两家知名户外电源品牌齐选松田元件](https://mp.weixin.qq.com/s/zeWSPhj8LSjuSplnt-3b2g) ## Source and attribution [松田电容助力电小二、正浩打造千瓦峰值输出户外电源](https://www.chongdiantou.com/archives/1755082377534.html) Original publisher: 充电头网 / Chongdiantou · Original author: 凌 · Originally published: 2025-08-13 STE edition: 2026-10-02 Adapted for STE under authorization from Chongdiantou. Photographs and historical tables are credited to the original report; the English text has been edited for clarity and technical context. ## Related products - [CE Series Safety Certified Disc Ceramic Capacitors (Class X1/Y2)](https://www.songtian-ste.com/en/products/ceramic-capacitors/ce-y2/) - [MPX/X2 Series Metallized Polypropylene Film Interference Suppression Capacitors (Class X2)](https://www.songtian-ste.com/en/products/film-capacitors/mpx-x2/) - [MPP/CBB21 Series Metallized Polypropylene Film Capacitors](https://www.songtian-ste.com/en/products/film-capacitors/cbb21/) - [MPB/CBB21B Series Box-Type Metallized Polypropylene Film Capacitors](https://www.songtian-ste.com/en/products/film-capacitors/mpb-cbb21b/)